Backwards Compatibility Notes

• This will likely be the final version supporting Python 2.7. Future
  releases will likely only work on Python 3.5+. See #109 for more
  context.
• There is a significant possibility that future versions will use
  Rust - instead of C - for compiled code. See #110 for more context.

Bug Fixes

• Some internal fields of C structs are now explicitly initialized.
  (Possible fix for #105.)
• The make_cffi.py script used to build the CFFI bindings now
  calls distutils.sysconfig.customize_compiler() so compiler
  customizations (such as honoring the CC environment variable)
  are performed. Patch by @Arfrever. (#103)
• The make_cffi.py script now sets LC_ALL=C when invoking
  the preprocessor in an attempt to normalize output to ASCII. (#95)

Changes

• Bundled zstandard library upgraded from 1.4.4 to 1.4.5. See release notes at https://github.com/facebook/zstd/releases/tag/v1.4.5.
• setup.py is now executable.
• Python code reformatted with black using 80 character line lengths.